9/16 Stud - 5.250 Long Broached

The 9/16 Stud - 5.250 Long Broached from ARP is a premium fastening component engineered for high-performance engine builds where reliability and precision are non-negotiable. Whether you're assembling a stroker engine, upgrading a turbo application, or reinforcing critical fastening points in a heavily modified powerplant, this stud delivers the structural integrity demanded by serious engine builders and mechanics. ARP studs are the industry standard in competition and street-performance circles because they eliminate the variability of standard hardware and ensure consistent clamping force across multiple heat cycles.

The 9/16-inch diameter and 5.250-inch length make this stud suitable for applications requiring robust fastening in large-displacement engines and heavy-duty assemblies. The broached design—precision-ground with a controlled underhead radius—provides superior surface finish and eliminates stress concentrations that can lead to fatigue failure. ARP's proprietary 8740 alloy steel and heat-treatment process delivers tensile strength and ductility that far exceed standard Grade 8 bolts, making these studs capable of withstanding extreme pressure, temperature cycling, and vibration inherent to forced-induction and high-RPM builds. Each stud ships as a single unit, allowing builders to replace worn hardware incrementally or source exact quantities for custom applications.

Engine builders, machine shops, and serious enthusiasts rely on these studs for cylinder head fastening, manifold mounting, and structural reinforcement in LSx, big-block Chevy, and other high-output engine platforms. The precision broaching ensures compatibility with ARP fastening systems and guarantees concentricity—critical when torque-to-yield methods or ultra-high clamping loads are specified. Installation requires proper torque wrenching and anti-seize compound on the threaded portion; always consult your engine builder's specifications and ARP's technical documentation to confirm application suitability and correct preload values for your specific build.